My #1 way to cook a pork tenderloin or a boneless pork loin because it's ALWAYS moist and tender. It's easy and foolproof! If you like, marinate the roast and rub with any seasonings that please your palate! So many people have asked me how long to cook tenderloins if they have "more than one" to cook, I wanted to give a simple response. ANSWER: So long as the tenderloins are NOT touching each other, cook 3 or 4 individual tenderloins for the same amount of time as if you were cooking one. Remember, each tenderloin is cooking in its own separate space. EXAMPLE: If cooking three 1-pound tenderloins, cook them only 5-1/5 minutes TOTAL. This makes it a great entree recipe when having a dinner party for 8-12 people, or more.